Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Market Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "June 1967," Federal Reserve Bulletin (June 1967) : 129-129. https://fraser.stlouisfed.org/title/62/item/21390/toc/5153 , accessed on March 29, 2024.